Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasa...16..130u&link_type=abstract
Publications Astronomical Society of Australia, vol. 16, no. 2, p. 130-133
Astronomy and Astrophysics
Astronomy
2
Quasars, Superluminal Sources
Scientific paper
We have used two subsamples of superluminal quasars to test the relativistic beaming model, and to place useful constraints on the radio source orientation hypothesis and cosmology. Based on the variation of the observed ratio R of the core-to-lobe radio luminosities with proper motion for the subsample of lobe-selected quasars, we show that the observed ratio R versus proper motion data can be explained in terms of a bulk relativistic motion with Lorentz factor of approx. 4. Also, from the observed proper motion versus redshift plot for this subsample, we show that a Lorentz factor of 4 implies a high density universe with deceleration parameter of 0.5. Furthermore, from the observed proper motion versus redshift plot for the two subsamples taken separately, we show that both the Lorentz factor and the proper motion for the core- selected subsample exceed those of the lobe-selected subsample by a factor of approx. 2 for the world model with deceleration parameter of 0.5. This result is demonstrated to be consistent with an orientation- based unified scheme in which lobe-selected quasars lie, on the average, at an angle which is a factor of 2 to 3 larger than that of their core- selected counterparts.
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